Bike Cellphone Charger • Chris Battaglia (ME) • Ajeetesh Govrineni (EE) • Kellen Warriner (IE)
Project Summary and Background Old Design • Second generation project (see right) • Design a bicycle cell phone charger for use in Haiti and other underdeveloped countries • Includes generator, breadboard, and phone holder • Total material cost should be <$15 and manufacturable on-site in Haiti • No heavy machinery used (lathe, mill, etc) • Time needed to charge a phone must be reasonable for the user • Nokia and Blackberry phones. Primarily target is the former • Design must be simple, robust, easily repaired/replaced, and adjustable Our Design
Design Summary Consists of two main sub-assemblies • Generator Housing • Generator is enclosed in plastic cylindrical housing with shaft extending out • Shaft is held against the tire of the bike, friction turns the shaft • Held to bike frame via two rubber-lined clamps joined with a bolt and wing nut Consists of two main sub-assemblies • Phone Holder • Contains breadboard and power connector • Comfortably holds Nokia and Blackberry phones and adjoining cables • Attached to handlebar of bike with two Velcro strips
Product Performance & Information • Half-charged a Nokia phone in 25 minutes • Takes approximately 6-8 hours of continuous use to deplete the battery • Requires 1-4 hours (based on speed) to fully charge a phone • Approximately 1:2 Work to Use Ratio on average CONTAINED IN KIT Generator + Housing Phone Connecting Power Cable Frame Attachment Bicycle USB Cable Phone Holder + Breadboard
Customer Needs and Results Quantitative Objectives Qualitative Objectives ~ ~
Testing • Current/Voltage test • Output at various speeds • See above graph • Rough road test • Road bike on rough terrain, checked generator positioning • Impact test • Drop test • Environmental Damage test • Water and dust test
Suggestions for Future Work • Better means of holding the nub of the generator shaft against the tire • Optimize potential output • Simplify installation • Cheaper components / overall cost reduction • Certain items are large contributors to the overall cost • Powerjack Cable, etc • Better generator? Remove breadboard?